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What Is an Amortization Schedule? How to Calculate with Formula


An amortization schedule is a complete table of periodic loan payments that shows the amount of principal and the amount of interest that comprise each payment until the loan is paid off at the end of its term. It reflects the breakdown of the payment over time, with the interest cost and principal repayment changing with every installment. The formula to calculate amortization is A = P[r(1+r)^n]/[(1+r)^n – 1], where A is the payment amount per period, P is the initial principal (loan amount), r is the interest rate per period, and n is the total number of payments (or periods).


The phonetics of the keyword “What Is an Amortization Schedule? How to Calculate with Formula” are as follows:- What: /wɒt/- Is: /ɪz/- an: /æn/- Amortization: /əˌmɔːtɪˈzeɪʃn/- Schedule: /ˈʃɛdjuːl/ – How: /haʊ/- to: /tuː/- Calculate: /ˈkælkjəleɪt/- with: /wɪð/- Formula: /ˈfɔːrmjʊlə/Please note that phonetic transcriptions may vary slightly based on accents and regional pronunciations. This transcription is mainly based on British English pronunciation.

Key Takeaways

  1. Definition of An Amortization Schedule: An amortization schedule reflects the pay-off plan of your loans. It’s a table outlining each payment towards a loan, showing the amount of interest and principal included in each payment. The schedule provides a detailed breakdown of the loan period, showing you how much you’re paying towards the principal and how much is going toward interest over time.
  2. The Importance of Amortization Schedule: An amortization schedule helps you understand exactly how your loan works. It tells you how much of your payments go towards interest versus principal every month. It provides visibility into how your debt decreases over time and can be a helpful tool if you’re considering prepayments on your loan.
  3. How to calculate using the Amortization Formula: The formula for an amortization schedule calculation is P = r(PV)/(1 – (1+r)^-n)). Where: P = payment, r = interest rate (per period), PV = loan amount (present value), and n = total number of payments (or periods). To build the schedule, you list each of your scheduled loan payments, then subtract the interest cost for the period (calculated as remaining loan balance multiplied by interest rate) to find out how much of the payment goes towards principal reduction, which then helps determine the remaining balance.


An amortization schedule is crucial in the fields of business and finance as it provides a detailed plan of how a loan will be paid off over time. It indicates the split between the principal amount (the initial amount borrowed) and the interest payments across the lifespan of the loan. This enables borrowers and lenders to understand precisely how much of each payment goes towards reducing the principal versus paying off interest, thus providing a clear view of the financial timeline. Having this clarity is important for strategic planning and determining affordability. Additionally, the use of the amortization formula (A = P[r(1 + r)n]/[(1 + r)n – 1]), where A represents the payment amount per period, P is the principal loan amount, r is the interest rate per period, and n is the number of payments, allows lenders and borrowers to compute possibilities under various scenarios, offering indispensable insights for financial decision-making.


An amortization schedule is essentially a complete table of periodic loan payments, showing the amount of principal and the amount of interest that make up each payment until the loan is paid off at the end of its term. Its purpose is to break down each payment into what amounts are going towards interest and what amounts are going towards the principal of the loan. This is valuable for the borrower, as it allows them to understand and visualize how each payment affects the total loan balance, and for the lender, to keep track of the outstanding balance over time.To calculate an amortization schedule, you’ll use the formula: A=P(1+(r/n))^(nt), where A is the total loan amount, P is the principal loan amount, r is the annual interest rate (in decimal form), n is the number of times that interest is compounded per year, and t is the loan term in years. The formula helps break down each payment into two parts: total interest paid over the life of the loan, and the total cost of the loan (interest plus principal). By using this formula, borrowers can have a clearer understanding of their financial obligation, and plan and manage their finances more effectively.


1. Home Mortgage: One of the most common applications of an amortization schedule is in a home mortgage. For example, if you take out a 30-year mortgage for $200,000 at 4% annual interest rate, an amortization schedule will outline your monthly payments for the next 360 months (30 years). It will break down every payment into principal and interest. In the early years, a bulk of your payment goes towards interest, while towards the end, it predominantly goes towards principal. The schedule allows you to see when you would have paid off half the principal, full principal, and how much interest you’re paying over the life of the loan.2. Car Loan: Another real-world application is in auto financing. Let’s say you purchase a new car for $25,000. You put down a 20% down payment ($5,000) and finance the rest ($20,000) at an annual interest rate of 5% for a period of 5 years. An amortization schedule will detail each of your monthly payments of around $377 over these 60 months. Similar to the mortgage example, it’ll highlight how much of it is going towards paying down the principal of your loan, and how much is going toward interest.3. Business Loans: Lastly, business loans also use amortization schedules. If a business borrows $50,000 to buy new equipment at an interest rate of 6% with a loan term of 7 years, an amortization schedule will lay out each of the 84 monthly payments, detailing the proportion that goes towards the principal and interest. This is extremely beneficial for the company’s financial planning; it can make accurate budget forecasts knowing exactly how much it has to pay back each month, as well as seeing the tax-deductible interest component.In all these examples, you can calculate an amortization schedule using the formula:A = P [r(1 + r)^n] / [(1 + r)^n – 1]where:A = monthly paymentP = principal loan amountr = monthly interest rate (annual rate/12)n = number of payments (months).You can use this formula manually to get the monthly payment, and then create a schedule of payments for each period, showing the split between principal and interest.

Frequently Asked Questions(FAQ)

What is an Amortization Schedule?

An Amortization Schedule is a complete table of periodic loan payments, showing the amount of principal and the amount of interest that comprise each payment until the loan is paid off at the end of its term.

How is an Amortization Schedule used in Finance and Business?

An Amortization Schedule is used in Finance and Business for outlining the repayment schedule of a loan. Businesses can use it to plan future payments and assess the impact of interest rates on loan repayment.

What are the key components of an Amortization Schedule?

The key components of an Amortization Schedule include the loan amount or principal, the periodic interest rate, the number of payments per year, the total number of payments, and the payment amount per period.

How to calculate using the Amortization Formula?

The basic formula to calculate an amortization schedule is: A = P[r(1+r)^n]/[(1+r)^n – 1], where:A is the payment amount per periodP is the initial principal (loan amount)r is the interest rate per periodn is the total number of payments (or periods)

What is an example of an Amortization Schedule calculation?

Given: P=$100,000, r=5% annual rate or (0.05/12)=0.004167 per month, n=30 years or 360 months.By plugging into the formula: A = [$100,000(0.004167(1+0.004167) ^ 360]/[(1+0.004167)^360 – 1] = $536.82/month.

Does the portion paid towards the principal increase over time in an Amortization Schedule?

Yes, in an Amortization Schedule, the early payments primarily cover interest costs. As the schedule progresses, a larger proportion of the payments goes toward paying down the principal.

Can the Amortization Schedule change over time?

Generally, an Amortization Schedule is fixed if the loan agreement terms remain the same. However, it may change if there is a loan refinance, modification of payment terms or prepayment of the loan.

Where can I find or create an Amortization Schedule?

You can create an Amortization Schedule using spreadsheet software like Excel or Google Sheets. You can also find online calculators or financial software that will generate an Amortization Schedule.

Related Finance Terms

  • Principal Amount: The initial total amount of loan that is borrowed from a lender. It does not include any interest charges.
  • Interest Rate: The percentage of the loan amount that a lender charges for borrowing money. These charges are added on top of the principal amount.
  • Amortization Period: The total length of time, usually described in years or months, that a borrower agrees to clear the loan with the lender.
  • Loan Payment: The regular amounts made by a borrower to the lender. Each payment is usually a mix of principal repayment and interest charges.
  • Outstanding Balance: The total amount of money still owed by the borrower at any given time during the loan period. It decreases with each payment as per the amortization schedule.

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